Is it ok to have preference for blondes or redheads or tall or slim? I think most people will agree it’s ok. Now, do you consider it ok to have preference (including sexual attraction) for youthful looks, in case it’s limited to people who are actually adult?
and act like a child
I don’t really remember any examples of hundreds year old loli vampires that actually act like kids. Shinobu certainly isn’t one. I didn’t include anything like this because OP specifically asks for adult appearances though.
supposed to be hundreds or even thousands of years old and that somehow magically makes it not weird or creepy to view this character sexually
And what do you think about irl people who are in their late 20s or 30s and look like teenagers?
Why not? It’s still mostly adult.
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Keep in mind that “Gushing over Magical Girls” is often considered hentai or borderline hentai by ecchi standards 😈
Any recs for anime that you think would enjoy a person who liked Shoujo Kakumei Utena?
In anime people also care about visuals, not only the story. Making certain characters have youthful looks is done to appeal to people who have preference for youthful looks, sometimes including sexual preference, and you also seem to agree it’s absolutely legitimate preference to have in case it’s limited to actual adults. The visual difference between “looking like children” and “having youthful looks” can be quite a subjective one, and that’s where everyone draws the line for themselves.